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Volume 16, issue 1
Ann. Geophys., 16, 25–33, 1998
© European Geosciences Union 1998
Ann. Geophys., 16, 25–33, 1998
© European Geosciences Union 1998

  31 Jan 1998

31 Jan 1998

Strong localized variations of the low-altitude energetic electron fluxes in the evening sector near the plasmapause

E. E. Titova1, T. A. Yahnina1, A. G. Yahnin1, B. B. Gvozdevsky1, A. A. Lyubchich1, V. Y. Trakhtengets2, A. G. Demekhov2, J. L. Horwitz3, F. Lefeuvre4, D. Lagoutte4, J. Manninen5, and T. Turunen5 E. E. Titova et al.
  • 1Polar Geophysical Institute, Murmansk Region, 184200, Apatity, Russia
  • 2Insitute of Applied Physics, 603600, Nizhny Novgorod, Russiaadst
  • 3The University of Alabama, Huntsville, USA
  • 4LPCE/CNRS, Orleans, France
  • 5Geophysical Observatory, Sodankylä , Finland

Abstract. Specific type of energetic electron precipitation accompanied by a sharp increase in trapped energetic electron flux are found in the data obtained from low-altitude NOAA satellites. These strongly localized variations of the trapped and precipitated energetic electron flux have been observed in the evening sector near the plasmapause during recovery phase of magnetic storms. Statistical characteristics of these structures as well as the results of comparison with proton precipitation are described. We demonstrate the spatial coincidence of localized electron precipitation with cold plasma gradient and whistler wave intensification measured on board the DE-1 and Aureol-3 satellites. A simultaneous localized sharp increase in both trapped and precipitating electron flux could be a result of significant pitch-angle isotropization of drifting electrons due to their interaction via cyclotron instability with the region of sharp increase in background plasma density.

Key words. Ionosphere (particle precipitation; wave-particle interaction) Magnetospheric Physics (plasmasphere)

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